The chanting is clear, as befits its educational purpose, and has a haunting quality, which its rival, Plainsong for Parishes, lacks. I am keen to find out when Volumes 2 (Advent - Candlemas) and 3 (Lent - Trinity) are due to be published.
My one gripe is that the Kyrie is the double form (for the Novus Ordo), not the triple, which might catch a few people out... however, it's not impossible to work out what to chant for the Extraordinary Form, and I suppose that it would have been harder to do the other way around...
The website advertises Gregorian chant tuition sessions, both one-day and residential, which Nick Gale leads. The testimonials page indicates that he has taken the workshops far and wide, and they have been very successful in giving confidence to parish choirs of all abilities.
I tried to upload a couple of the tracks to the blog without success, but you can listen to the Asperges by clicking on the Recordings page of the website.